Viessmann GC1 - Sensors

Vitotronic 100, GC1B / Vitotronic 300-K, MW1B Installation and Service
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Components
Note:
H The supply temperature sensor can be used as a
contact or immersion temperature sensor.
Note: The supply temperature sensor in the mixing
valve extension kit is a contact temperature
sensor.
Sensors
Boiler water, DHW tank, supply, return and room
temperature sensors
Viessmann NTC 10 kΩ (blue identification)
1. Pull corresponding plug.
2. Check the sensor resistance and compare it with the
curve.
3. In the case of severe deviation, check the installation
and replace the sensor if required.
Viessmann NTC 10 kΩ (blue identification)
1. Pull plug !.
2. Check the sensor resistance across plug terminals
“1” and “2” and compare with the curve.
3. If the results are very different from the curve,
disconnect the wires from the sensor and repeat the
test on the sensor.
4. Depending on the result, replace the lead or the
outside temperature sensor.
Outside temperature sensor
Temperature
Resistance in k ohms
Temperature
Resistance in k ohms
When a limit entered in the Vitotronic 100 is reached
(see coding address “1F” in group 2 “Boiler”), a service
message appears.
1. Disconnect plug aG.
2. Check the sensor resistance and compare it with the
curve.
3. In the case of severe deviation, check the installation
and replace the sensor if required.
Flue gas temperature sensor
Viessmann NTC 20 kΩ (orange identification)
Boiler water, DHW tank, supply, return and room
temperature sensors
Outside temperature sensor
Flue gas temperature sensor
Temperature
Resistance in k ohms